Circular saw



NOV. 19, 1929. R, WALKER l1,736,560

CIRCULAR SAW Filed Jan. 51, l1929 Jig/fifa@ Patented Nov. 19, 1929 UNITESTTES IRL R. WALKER, OF SHREVEPORT, LOUESANA, ASSIGNOR 'lO R. HOE & C0.,INC.,.OF'

Artur orrlcu NEW' YORK, N. Y., A CORPORATION OF NEW YORK CIRCULAR SAWApplication filed January 31, 1929. SeriaI No. 336,495.

The present invention relates to circular saws of the class used forcutting the blocks from which barrel heads are made and which aregenerally known as heading saws.

Saws ot this class have in the past been made with uniformly taperingsection, relatively thick at the center and thin at the periphery. Theside of the saw which is placed against the flange of the saw arbor isusually made flat, and the slope of the taper is entirely on the outerside of the saw, that being the side which runs next to the piece thatis cut oi.

The theoretical basis for this construction is, that the saw being i'laton the side next to the block being cut, causes it to cut straight onthat side, and even though the saw is thicker at the center than at theedge, the piece being cut off will spring away sui'liciently to giveample clearance for the saw.

It has been found that saws made in this manner show a tendency to bedeflected to- Yard the block because the pressure due to cutting, is ina plane close to the flat side of the saw, and there is a lack ofsupport outside oi the plane of the thrust.

It is the object of the invention disclosed herein to provide a saw thatis formed with a greater' thickness in the portion of the plate which isbetween the axial center and the periphery, whereby the plate is madestiter and its deflection is prevented.

It is also an object of the invention to provide a saw in which thesides are so tapered that the pressure resulting from cutting will be ina plane which is Well within the body of the plate.

"With the foregoing' and other objects in view, which will appear as thedescription proceeds, the invention resides in the co1nbination andarrangement of parts, and in the details of construction hereinafterdescribed and claimed, it being understood that vari ous changes in theprecise embodiment of the invention herein disclosed may be made withinthe scope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawing:

Figure 1 shows a side view of the improved heading saw.

Figure 2 shows a sectional view of the torni for the saw plate taken onthe line A-A of Figure 1 and viewed in the direction of arrow 2.

Figure 3 is an enlarged sectional view through a portion of the platewith the di mensions distorted to better show its form.

Figure i is a greatly enlarged view of a single tooth of the saw showingthe shape oi' the cutting edge and as viewed in the direction of arrow 1of Figure 5; and

Figure 5 is agreatly enlarged View of a fragment ot the periphery of thesaw as viewed from one side, showing the shape of a tooth.

Referring to the drawing; the saw plate is indicated at 11, the teeth at12, and the center hole at 13. The axis of the saw passes through. thecenter hole and is indicated at 111.

rEhe plate is made thicker near the center than at the periphery andtapering in cross section. T he side ot'the cross section which is theoutside of the saw extends in a straight line from the hole 13 to apoint` close to the periphery oi the saw, this being in accordance withcommon practice. The other side, however, which is the inside of the sawis a broken line, the first portion of which is perpendicular to theaxis of the saw and extends from the center hole 13 to a junction pointwhich maybe the point 15. The second portion ot the line extends fromthe junction point to a point on the periphery ot the sawA hus the crosssection ot the plate at the junction point is thickened, and the surfaceon that side of the plate is divided into two Zones, a iiat central zonebounded by the circle 15 drawn through the junction point- 15,'and anouter zone extending from the circle 15 to the periphery and whichslopes toward the plane of thrust which lies within the body of the sawand is indicated by the line 16.

In conformity with General practice the teeth 12 are swaged on thecutting edge 17 to a greater width than the thickness or the plateelsewhere on its periphery. Y

The plane ot thrust indicated by the line 16 is perpendicular to theaxis of the saw andpasscs through the center of the teeth.

In the form ot saw herein disclosed, the plane oi' thrust is Within thesaw plate a greater distance from the inside face of the saw than itwould be if the inside face was a flat surtace which extended to theperiphery. In consequence, the tendency to deflect the saw in operationis lessened. Furthermore, any deflection of the saw that may occur7 willcause the thickened portion of the plate to bear against the block beingcut and prevent further deflection.

It Will be understood that the proportions ot the saw as shown inFigures 2 and 3 are necessarily distorted in order to explain theinvention, and that the location ot' the junction point l5 can bechanged Without materially allecting the operation of the saw.Satisfactory operation has resulted when the diameter of the fiat ZoneWas made more than one half, and less than three quarters of thediameter of the saw.

TvVh'at I claim is:

l. A circular saw which has a greater thickness at the center hole thanat the periphery, has a surface on one side that slopes throughout itsextent, and a surface on the other side that comprises a flat centralzone and a sloping outer Zone.

2. A circular sau7 having a surface on one of its sides that slopesthroughout its extent, and having a surface on its other side thatcomprises a flat central zone and an outer zone which slopes from thecentral zone toward a plane Within the body of the saw and perpendicularto its axis.

8. A Acircular saw, the cross section ot Which tapers, one side being astraight line extending `from a point near the center hole of the saw toa point adjacent the periphery of the saw, and the other side being abroken line, one portion of which is perpendicular to the axis oi3 thesan7 and extends from a point near its center hole to a junction pointthat is a greater' distance from the axis than one fourth of thediameter of the saw, and the other portion of which extends troni thejunction point to a point adjacent the periphery of the saw.

e. A circular saw, the cross section of which tapers1 one side being astraight line extending from a point near the center hole ot the san7 toa point adjacent the periphery of the n saw and the other side being aVbroken line, the iii-st portion of Which is perpendicular to the axisof the saw and extends from a point lnear its center hole to a junctionpoint and the second portion of which extends from the junction point toa point adjacent the periphery of the saw, the length of the secondportion of the broken line being less than equal to, but

.greater than one third the length ot the lirst portion.

In testimony whereof, I afix my signature.

iRL n. WALKER.

